/
hednsProvider.go
757 lines (644 loc) · 20.2 KB
/
hednsProvider.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
package hedns
import (
"crypto/sha1"
"encoding/json"
"fmt"
"net/http"
"net/http/cookiejar"
"net/url"
"os"
"path"
"sort"
"strconv"
"strings"
"time"
"github.com/PuerkitoBio/goquery"
"github.com/StackExchange/dnscontrol/v4/models"
"github.com/StackExchange/dnscontrol/v4/pkg/diff2"
"github.com/StackExchange/dnscontrol/v4/pkg/txtutil"
"github.com/StackExchange/dnscontrol/v4/providers"
"github.com/pquerna/otp/totp"
)
/*
Hurricane Electric DNS provider (dns.he.net)
Info required in `creds.json`:
- username
- password
Either of the following settings is required when two factor authentication is enabled:
- totp (TOTP code if 2FA is enabled; best specified as an env variable)
- totp-key (shared TOTP secret used to generate a valid TOTP code; not recommended since
this effectively defeats the purpose of two factor authentication by storing
both factors at the same place)
Additionally
- session-file-path (Path where a '.hedns-session' file will be created to allow a
session to persist between executions)
*/
var features = providers.DocumentationNotes{
// The default for unlisted capabilities is 'Cannot'.
// See providers/capabilities.go for the entire list of capabilities.
providers.CanAutoDNSSEC: providers.Cannot(),
providers.CanGetZones: providers.Can(),
providers.CanConcur: providers.Cannot(),
providers.CanUseAlias: providers.Can(),
providers.CanUseCAA: providers.Can(),
providers.CanUseDS: providers.Cannot(),
providers.CanUseDSForChildren: providers.Cannot(),
providers.CanUseLOC: providers.Can(),
providers.CanUseNAPTR: providers.Can(),
providers.CanUsePTR: providers.Can(),
providers.CanUseSOA: providers.Cannot(),
providers.CanUseSRV: providers.Can(),
providers.CanUseSSHFP: providers.Can(),
providers.CanUseTLSA: providers.Cannot(),
providers.DocCreateDomains: providers.Can(),
providers.DocDualHost: providers.Can(),
providers.DocOfficiallySupported: providers.Cannot(),
}
func init() {
fns := providers.DspFuncs{
Initializer: newHEDNSProvider,
RecordAuditor: AuditRecords,
}
providers.RegisterDomainServiceProviderType("HEDNS", fns, features)
}
var defaultNameservers = []string{
"ns1.he.net",
"ns2.he.net",
"ns3.he.net",
"ns4.he.net",
"ns5.he.net",
}
const (
apiEndpoint = "https://dns.he.net/"
sessionFileName = ".hedns-session"
errorInvalidCredentials = "Incorrect"
errorInvalidTotpToken = "The token supplied is invalid."
errorTotpTokenRequired = "You must enter the token generated by your authenticator."
errorTotpTokenReused = "This token has already been used. You may not reuse tokens."
errorImproperDelegation = "This zone does not appear to be properly delegated to our nameservers."
)
// hednsProvider stores login credentials and represents and API connection
type hednsProvider struct {
Username string
Password string
TfaSecret string
TfaValue string
SessionFilePath string
httpClient http.Client
}
// Record stores the HEDNS specific zone and record IDs
type Record struct {
RecordName string
RecordID uint64
ZoneName string
ZoneID uint64
}
func newHEDNSProvider(cfg map[string]string, _ json.RawMessage) (providers.DNSServiceProvider, error) {
username, password := cfg["username"], cfg["password"]
totpSecret, totpValue := cfg["totp-key"], cfg["totp"]
sessionFilePath := cfg["session-file-path"]
if username == "" {
return nil, fmt.Errorf("username must be provided")
}
if password == "" {
return nil, fmt.Errorf("password must be provided")
}
if totpSecret != "" && totpValue != "" {
return nil, fmt.Errorf("totp and totp-key must not be specified at the same time")
}
// Perform the initial login
client := &hednsProvider{
Username: username,
Password: password,
TfaSecret: totpSecret,
TfaValue: totpValue,
SessionFilePath: sessionFilePath,
}
// Create storage for the cookies
cookieJar, _ := cookiejar.New(nil)
client.httpClient = http.Client{Jar: cookieJar}
err := client.authenticate()
return client, err
}
// ListZones list all zones on this provider.
func (c *hednsProvider) ListZones() ([]string, error) {
domainsMap, err := c.listDomains()
if err != nil {
return nil, err
}
domains := make([]string, 0, len(domainsMap))
for domain := range domainsMap {
domains = append(domains, domain)
}
// Ensure the order is deterministic
sort.Strings(domains)
return domains, err
}
// EnsureZoneExists creates a zone if it does not exist
func (c *hednsProvider) EnsureZoneExists(domain string) error {
domains, err := c.ListZones()
if err != nil {
return err
}
for _, d := range domains {
if d == domain {
return nil
}
}
return c.createDomain(domain)
}
// GetNameservers returns the default HEDNS nameservers.
func (c *hednsProvider) GetNameservers(_ string) ([]*models.Nameserver, error) {
return models.ToNameservers(defaultNameservers)
}
// GetZoneRecordsCorrections returns a list of corrections that will turn existing records into dc.Records.
func (c *hednsProvider) GetZoneRecordsCorrections(dc *models.DomainConfig, records models.Records) ([]*models.Correction, error) {
// Get the SOA record to get the ZoneID, then remove it from the list.
zoneID := uint64(0)
var prunedRecords models.Records
for _, r := range records {
if r.Type == "SOA" {
zoneID = r.Original.(Record).ZoneID
} else {
prunedRecords = append(prunedRecords, r)
}
}
return c.getDiff2DomainCorrections(dc, zoneID, prunedRecords)
}
func (c *hednsProvider) getDiff2DomainCorrections(dc *models.DomainConfig, zoneID uint64, records models.Records) ([]*models.Correction, error) {
changes, err := diff2.ByRecord(records, dc, nil)
if err != nil {
return nil, err
}
var corrections []*models.Correction
for _, change := range changes {
switch change.Type {
case diff2.REPORT:
corrections = append(corrections, &models.Correction{Msg: change.MsgsJoined})
case diff2.CREATE:
record := change.New[0]
corrections = append(corrections, &models.Correction{
Msg: change.MsgsJoined,
F: func() error {
return c.createZoneRecord(zoneID, record)
},
})
case diff2.CHANGE:
record := change.New[0]
recordID := change.Old[0].Original.(Record).RecordID
corrections = append(corrections, &models.Correction{
Msg: change.MsgsJoined,
F: func() error {
return c.changeZoneRecord(zoneID, recordID, record)
},
})
case diff2.DELETE:
recordID := change.Old[0].Original.(Record).RecordID
corrections = append(corrections, &models.Correction{
Msg: change.MsgsJoined,
F: func() error {
return c.deleteZoneRecord(zoneID, recordID)
},
})
default:
panic(fmt.Sprintf("unhandled change.Type %s", change.Type))
}
}
return corrections, nil
}
// GetZoneRecords returns all the records for the given domain
func (c *hednsProvider) GetZoneRecords(domain string, meta map[string]string) (models.Records, error) {
var zoneRecords []*models.RecordConfig
// Get Domain ID
domains, err := c.listDomains()
if err != nil {
return nil, err
}
domainID, domainExists := domains[domain]
if !domainExists {
return nil, fmt.Errorf("domain %s does not exist", domain)
}
queryURL, _ := url.Parse(apiEndpoint)
q := queryURL.Query()
q.Add("hosted_dns_zoneid", strconv.FormatUint(domainID, 10))
q.Add("menu", "edit_zone")
q.Add("hosted_dns_editzone", "")
queryURL.RawQuery = q.Encode()
response, err := c.httpClient.Get(queryURL.String())
if err != nil {
return nil, err
}
defer response.Body.Close()
// Parse the HTML response
document, err := goquery.NewDocumentFromReader(response.Body)
if err != nil {
return nil, err
}
// Check we can find the zone records
if document.Find("#dns_main_content").Size() == 0 {
return nil, fmt.Errorf("zone records listing failed")
}
// Load all the domain records
recordSelector := "tr.dns_tr, tr.dns_tr_dynamic, tr.dns_tr_locked"
document.Find(recordSelector).EachWithBreak(func(index int, element *goquery.Selection) bool {
parser := elementParser{}
rc := &models.RecordConfig{
Type: parser.parseStringAttr(element.Find("td > .rrlabel"), "data"),
TTL: parser.parseIntElementUint32(element.Find("td:nth-child(5)")),
Original: Record{
ZoneName: domain,
ZoneID: domainID,
RecordName: parser.parseStringElement(element.Find(".dns_view")),
RecordID: parser.parseIntAttr(element, "id"),
},
}
data := parser.parseStringAttr(element.Find("td:nth-child(7)"), "data")
if err != nil {
return false
}
priority := parser.parseIntElementUint16(element.Find("td:nth-child(6)"))
if parser.err != nil {
err = parser.err
return false
}
// Ignore record types that dnscontrol does not support
if rc.Type == "HINFO" || rc.Type == "AFSDB" || rc.Type == "RP" {
return true
}
rc.SetLabelFromFQDN(rc.Original.(Record).RecordName, domain)
switch rc.Type {
case "ALIAS":
err = rc.SetTarget(data)
case "MX":
// dns.he.net omits the trailing "." on the hostnames for MX records
err = rc.SetTargetMX(priority, data+".")
case "SRV":
err = rc.SetTargetSRVPriorityString(priority, data)
case "SPF":
// Convert to TXT record as SPF is deprecated
rc.Type = "TXT"
fallthrough
default:
err = rc.PopulateFromStringFunc(rc.Type, data, domain, txtutil.ParseQuoted)
}
if err != nil {
return false
}
zoneRecords = append(zoneRecords, rc)
return true
})
return zoneRecords, err
}
func (c *hednsProvider) authResumeSession() (authenticated bool, requiresTfa bool, err error) {
response, err := c.httpClient.Get(apiEndpoint)
if err != nil {
return false, false, err
}
defer response.Body.Close()
document, err := c.parseResponseForDocumentAndErrors(response)
if err != nil {
// Deal with the edge case where we have attempted to use the same authentication token more than two times
if err.Error() == errorTotpTokenRequired {
return false, true, nil
}
return false, false, err
}
// Look for the presence of the login button or the TFA input
authenticated = document.Find("#_tlogout").Size() > 0
requiresTfa = document.Find("input#tfacode").Size() > 0
return authenticated, requiresTfa, err
}
func (c *hednsProvider) authUsernameAndPassword() (authenticated bool, requiresTfa bool, err error) {
// Login with username and password
response, err := c.httpClient.PostForm(apiEndpoint, url.Values{
"email": {c.Username},
"pass": {c.Password},
"submit": {"Login!"},
})
if err != nil {
return false, false, err
}
defer response.Body.Close()
document, err := c.parseResponseForDocumentAndErrors(response)
if err != nil {
if err.Error() == errorInvalidCredentials {
err = fmt.Errorf("authentication failed with incorrect username or password")
}
if err.Error() == errorTotpTokenRequired {
return false, true, nil
}
return false, false, err
}
authenticated = document.Find("#_tlogout").Size() > 0
requiresTfa = document.Find("input#tfacode").Size() > 0
// Completed and 2FA is not required
return authenticated, requiresTfa, err
}
func (c *hednsProvider) auth2FA() (authenticated bool, err error) {
if c.TfaValue == "" && c.TfaSecret == "" {
return false, fmt.Errorf("account requires two-factor authentication but neither totp or totp-key were provided")
}
if c.TfaValue == "" && c.TfaSecret != "" {
var err error
c.TfaValue, err = totp.GenerateCode(c.TfaSecret, time.Now())
if err != nil {
return false, err
}
}
response, err := c.httpClient.PostForm(apiEndpoint, url.Values{
"tfacode": {c.TfaValue},
"submit": {"Submit"},
})
if err != nil {
return false, err
}
defer response.Body.Close()
document, err := c.parseResponseForDocumentAndErrors(response)
if err != nil {
switch err.Error() {
case errorInvalidTotpToken:
err = fmt.Errorf("invalid TOTP token value")
case errorTotpTokenReused:
err = fmt.Errorf("TOTP token was reused within its period (30 seconds)")
}
return false, err
}
authenticated = document.Find("#_tlogout").Size() > 0
return authenticated, err
}
func (c *hednsProvider) authenticate() error {
if c.SessionFilePath != "" {
_ = c.loadSessionFile()
}
authenticated, requiresTfa, err := c.authResumeSession()
if err != nil {
return err
}
if !authenticated {
// Only perform username and password login if two-factor authentication is not required at this stage
if !requiresTfa {
authenticated, requiresTfa, err = c.authUsernameAndPassword()
if err != nil {
return err
}
}
// Only perform two-factor authentication if required
if requiresTfa {
authenticated, err = c.auth2FA()
if err != nil {
return err
}
}
}
if !authenticated {
err = fmt.Errorf("unknown authentication failure")
} else {
if c.SessionFilePath != "" {
err = c.saveSessionFile()
}
}
return err
}
func (c *hednsProvider) listDomains() (map[string]uint64, error) {
response, err := c.httpClient.Get(apiEndpoint)
if err != nil {
return nil, err
}
defer response.Body.Close()
document, err := goquery.NewDocumentFromReader(response.Body)
if err != nil {
return nil, err
}
// Check there are any domains in this account
domains := make(map[string]uint64)
if document.Find("#domains_table").Size() == 0 {
return domains, nil
}
// Find all the forward & reverse domains
recordsSelector := strings.Join([]string{
"#domains_table > tbody > tr > td:last-child > img", // Forward records
"#tabs-advanced .generic_table > tbody > tr > td:last-child > img", // Reverse records
}, ", ")
document.Find(recordsSelector).EachWithBreak(func(index int, element *goquery.Selection) bool {
domainID, idExists := element.Attr("value")
domainName, nameExists := element.Attr("name")
if idExists && nameExists {
domains[domainName], err = strconv.ParseUint(domainID, 10, 64)
return err == nil
}
return true
})
return domains, err
}
func (c *hednsProvider) createDomain(domain string) error {
values := url.Values{
"action": {"add_zone"},
"retmain": {"0"},
"add_domain": {domain},
"submit": {"Add Domain!"},
}
response, err := c.httpClient.PostForm(apiEndpoint, values)
if err != nil {
return err
}
defer response.Body.Close()
_, err = c.parseResponseForDocumentAndErrors(response)
return err
}
func (c *hednsProvider) editZoneRecord(zoneID uint64, recordID uint64, rc *models.RecordConfig, create bool) error {
values := url.Values{
"account": {},
"menu": {"edit_zone"},
"hosted_dns_zoneid": {strconv.FormatUint(zoneID, 10)},
"hosted_dns_editzone": {"1"},
"TTL": {strconv.FormatUint(uint64(rc.TTL), 10)},
"Name": {rc.Name},
}
// Select the correct mode and deal with the quirks
if create {
values.Set("Type", rc.Type)
values.Set("hosted_dns_editrecord", "Submit")
values.Set("hosted_dns_recordid", "")
values.Set("Priority", "")
} else {
values.Set("Type", strings.ToLower(rc.Type)) // Lowercase on update
values.Set("hosted_dns_editrecord", "Update")
values.Set("hosted_dns_recordid", strconv.FormatUint(recordID, 10))
values.Set("Priority", "-")
}
// Work out the content
switch rc.Type {
case "MX":
values.Set("Priority", strconv.FormatUint(uint64(rc.MxPreference), 10))
values.Set("Content", rc.GetTargetField())
case "SRV":
values.Del("Content")
values.Set("Target", rc.GetTargetField())
values.Set("Priority", strconv.FormatUint(uint64(rc.SrvPriority), 10))
values.Set("Weight", strconv.FormatUint(uint64(rc.SrvWeight), 10))
values.Set("Port", strconv.FormatUint(uint64(rc.SrvPort), 10))
default:
values.Set("Content", rc.GetTargetCombinedFunc(txtutil.EncodeQuoted))
}
response, err := c.httpClient.PostForm(apiEndpoint, values)
if err != nil {
return err
}
defer response.Body.Close()
_, err = c.parseResponseForDocumentAndErrors(response)
return err
}
func (c *hednsProvider) createZoneRecord(zoneID uint64, rc *models.RecordConfig) error {
return c.editZoneRecord(zoneID, 0, rc, true)
}
func (c *hednsProvider) changeZoneRecord(zoneID uint64, recordID uint64, rc *models.RecordConfig) error {
return c.editZoneRecord(zoneID, recordID, rc, false)
}
func (c *hednsProvider) deleteZoneRecord(zoneID uint64, recordID uint64) error {
values := url.Values{
"menu": {"edit_zone"},
"hosted_dns_zoneid": {strconv.FormatUint(zoneID, 10)},
"hosted_dns_recordid": {strconv.FormatUint(recordID, 10)},
"hosted_dns_editzone": {"1"},
"hosted_dns_delrecord": {"1"},
"hosted_dns_delconfirm": {"delete"},
}
response, err := c.httpClient.PostForm(apiEndpoint, values)
if err != nil {
return err
}
defer response.Body.Close()
_, err = c.parseResponseForDocumentAndErrors(response)
return err
}
func (c *hednsProvider) generateCredentialHash() string {
hash := sha1.New()
hash.Write([]byte(c.Username))
hash.Write([]byte(c.Password))
hash.Write([]byte(c.TfaSecret))
return fmt.Sprintf("%x", hash.Sum(nil))
}
func (c *hednsProvider) saveSessionFile() error {
cookieDomain, err := url.Parse(apiEndpoint)
if err != nil {
return err
}
// Put the credential hash on the first lines
entries := []string{
c.generateCredentialHash(),
}
for _, cookie := range c.httpClient.Jar.Cookies(cookieDomain) {
entries = append(entries, strings.Join([]string{cookie.Name, cookie.Value}, "="))
}
fileName := path.Join(c.SessionFilePath, sessionFileName)
err = os.WriteFile(fileName, []byte(strings.Join(entries, "\n")), 0600)
return err
}
func (c *hednsProvider) loadSessionFile() error {
cookieDomain, err := url.Parse(apiEndpoint)
if err != nil {
return err
}
fileName := path.Join(c.SessionFilePath, sessionFileName)
bytes, err := os.ReadFile(fileName)
if err != nil {
if os.IsNotExist(err) {
// Skip loading the session.
return nil
}
return err
}
var cookies []*http.Cookie
for i, entry := range strings.Split(string(bytes), "\n") {
if i == 0 {
if entry != c.generateCredentialHash() {
return fmt.Errorf("invalid credential hash in session file")
}
} else {
kv := strings.Split(entry, "=")
if len(kv) == 2 {
cookies = append(cookies, &http.Cookie{
Name: kv[0],
Value: kv[1],
})
}
}
}
c.httpClient.Jar.SetCookies(cookieDomain, cookies)
return err
}
func (c *hednsProvider) parseResponseForDocumentAndErrors(response *http.Response) (document *goquery.Document, err error) {
var ignoredErrorMessages = [...]string{
errorImproperDelegation,
}
document, err = goquery.NewDocumentFromReader(response.Body)
if err != nil {
return nil, err
}
// Check for any errors ignoring irrelevant errors
document.Find("div#dns_err").EachWithBreak(func(index int, element *goquery.Selection) bool {
errorMessage := element.Text()
for _, ignoredMessage := range ignoredErrorMessages {
if strings.Contains(errorMessage, ignoredMessage) {
return true
}
}
err = fmt.Errorf(element.Text())
return false
})
return document, err
}
type elementParser struct {
err error
}
func (p *elementParser) parseStringAttr(element *goquery.Selection, attr string) (result string) {
if p.err != nil {
return
}
result, exists := element.Attr(attr)
if !exists {
p.err = fmt.Errorf("could not locate attribute %s", attr)
}
return result
}
func (p *elementParser) parseIntAttr(element *goquery.Selection, attr string) (result uint64) {
if p.err != nil {
return
}
if value, exists := element.Attr(attr); exists {
result, p.err = strconv.ParseUint(value, 10, 64)
} else {
p.err = fmt.Errorf("could not locate attribute %s", attr)
}
return result
}
func (p *elementParser) parseStringElement(element *goquery.Selection) (result string) {
if p.err != nil {
return
}
return element.Text()
}
func (p *elementParser) parseIntElementUint16(element *goquery.Selection) uint16 {
if p.err != nil {
return 0
}
// Special case to deal with Priority
if element.Text() == "-" {
return 0
}
var result64 uint64
result64, p.err = strconv.ParseUint(element.Text(), 10, 16)
return uint16(result64)
}
func (p *elementParser) parseIntElementUint32(element *goquery.Selection) uint32 {
if p.err != nil {
return 0
}
// Special case to deal with Priority
if element.Text() == "-" {
return 0
}
var result64 uint64
result64, p.err = strconv.ParseUint(element.Text(), 10, 32)
return uint32(result64)
}